code: def __getitem__(self, key):
      return getattr(self, key)
  
imports: import warnings
  import torch
  import torch.nn
  from espnet2.enh.layers.dptnet import ImprovedTransformerLayer
  from espnet2.enh.layers.tcn import ChannelwiseLayerNorm
  from espnet2.torch_utils.get_layer_from_string import get_layer
label_desc: Use image node_id 2 for calling the ChannelAttention obj's underlying member method code with example usage: obj.__getitem__(key) and returns: getattr